Brush-support for dynamo-electric machines.



fw. M.

GOFFMAN. BRUSH SUPPORT FOB DYNAMO ELECTRIC MACHINES.

APPLICATION PLED 00T.9,1906.

Patented Apr. 6, 1909.

" Witnesses:

IUNITED STATES `PATENT OEEIOE,

WALTER M. C'OFFMAN, OF MADISON, WISCONSIN, ASSIGNOR To NORTHERN ELECTRICAL MANUFACTURING COMPANY, A CORPORATION or WISCONSIN.

iBRUssnrPo'nT ROR' DYNAno-ELECTRIC u'Ac'HINEs.

To all whom 'it may concern: j

Be it known that I, WALTER M. 'Corri/IAN,

r a'citizen of the United States, residing lat Madison, county of'Dane, State OfvWisconsin, have invented certain new and useful Improvementsin Brush-Supports vfor/ Dynamo-Electric`Machines, -of which the following is a specification.

My invention relates to machines and morev particularly to means Jfor supporting the brushes thereof, and has for its object. to provide a cheap, simple and compact arrangement whereby the brushes may .be eectively supported in operative relation to the commutator or other current.-

- collecting device.

To the above end my invention comprises the novel features of construction to be hereinafter particularly pointed lout in the claims. For 'a complete understanding of my invention, however, and of its various objects and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawing, whereinj F igurel shows partly in side elevation and vpartly in cross-section a machine equippedy with brush-holder devices arranged In ac- `cordance with one' form of my invention;

Fig. 2 is a plan view of the machine shown in Fig. l; and Figs. '3 and Llare, respectively,

side and end elevations ofthe brush-holder `ring or yoke. I

from an annular ring 8 which is concentric.

with the armature shaft andis Supported from its outerl edge by the`bonnet 3. The connection between the ring and the bonnet consists preferably of a slioulder or shoulders 9 located on the interior of the bonnet, together with means .suchas screws l0 for holding the ring against the shoulder, or shoulders. In order that the ring may be conveniently and accurately-adjusted and be Speicaltion of Letters Patent. Ajpneafion :ned october 9, 1906-. serial Nq. 338,113.

dynamo electric 'held rigidly in place, I prefer-to bevel the outer edge thereof, as at 1]., and to'so arrange the screws that they bear upon the patente@ April 6, 190e.

bevel Surfaces' whereb when the screws are tightened', the ring is firmly wedged in place.

this arrangement accurate machining of the parts Is unnecessaryysince small Irregularities are compensated for by the vwedging connection. The brushes may be adjusted into any-desired position circumferentially of the commutator by simply loosening the screws and turning {the ring. vThe brushes may be carried from the supporting ring in any suitable way, preferably by providing the ring with inwardly projecting openended jaws l2, and securing the brushholder studs 1.3 therein tby means of nutsllf.-

In .this arrangement the vbrush-holders and studs may bey readily adjusted toward and from the Commutator by simply; loosening the nuts lwhich hold -them in place and moving them radially. It .will furthermore be seen'that the brush-holders may be effect.- ively insulated from each other, since substantial washers 15 and sleeves'l may be While I have described in detail the best form'of my invention now known to me, I do not desire to limit my invention to this particular form, since in its broaderfaspects it may be embodied in various. other forms as willbe'evident from the definitions thereof in the appended claims.

What I claim as new and desireto secure by Letters Patent of the United States, is,-

1. In a dynamo-electric machine, a `bonnetat one end thereof, a brush-supporting ring having a beveled outer edge, a shoulder in said bonnet against which the outer portion of the ring bears, and a screw carried by Said bonnet and engaging said beveled edge of the ring for forcing it against the shoulder. f f f 2. In a dynamo-electric machine, a bonnet at one end thereof, said bonnet having ,a

v Aplaced between the ringV and the brushholder studs even in very smallmachiiies.

at one end thereof having a. bearing for the l I 4net against which the outer portion of the said bonnet against which the outer ortion oftheK ring bears, a screw carried fy said 1,5 bonnet and engaging said beveled edge of the ring for forcing 1t against the shoulder, said ring having internal radially-extending jaws, and brush-holders secured in said jawsD 3. In adynanioeeiectrio machine, a'bonnet y armature shaft,A a brush- Supporting 'ring concentric with said bearin and having a beveled outer edge, a shoul er in said boniing bears, and means arranged on said bonnet'to engage thebeveled edge of said ring and thereby force 1said ring against said E my hand this 4th day lof October, 1906e shoulder.

Y WALTER M. ooFFnf.`

Witnesses: I f

JOHN P., MALLETr, FRANK E. FISHER.

4. 1n a dynamo-electric machine, a bonnet at one end thereof,.a brush-supportin ring having a beveled outer edge7 a shoul er in In 'Witness whereof, I have lhereunto set. gg.- 

